This J2EE tip is demonstrating a method of reading a header in a request. When an HTTP
client (e.g. a browser) sends a request, it is required to supply a request line
(usually GET or POST). If it wants to, it can also send a number of headers, all
of which are optional except for Content-Length, which is required only for POST
requests. Here are some example of headers: Accept-Encoding, Accept-Charset,
Connection, Content, Cookie, Pragma etc.